Finally, a simple four nodes reliability test system is been applied for assessing to demonstrating protection can adaptive adjust the blocking criterion function to the trend turned under continuous fault conditions, confirmed the safety of the relay device. 对4节点简易可靠性测试系统的评估结果表明,继电保护具备连续故障条件下自适应潮流转向而调整闭锁判据的功能,证实了继电装置的安全度。